Two-revolution reciprocating flat-bed printing-press.



A. L. COLBURN.

TWO-REVOLUTION RECIPROCATING FLAT BED PRINTING PRESS.

APPLICATION FILED SEPT 2|. I914- Patented Apr. 27, 1915.

3 SHEETSSHEET I.

THE NORRIS PETERS 60., FHOTOLIYHOH WASHING TON, D. c.

A. L. COLBURN..

TWO-REVOLUTION RECIPROCATING FLAT BED PRINTING PRESS.

APPLICATION FILED SEPT. 2|. I914.

1,1 37,383. P tented Apr. 27, 1915.

3 SHEETSSHEET 2.

THE NORRIS PETERS 60., PHOTO-LITHQ. wAsH/Nnr w, Q

- A. L. COLBURN.

TWO-REVOLUTION RECIPROCATING FLAT BED PRINTING PRESS.

APPLICATION FILED SEPT. 21, 1914.

1,137,383, Patented Apr. 27, 1915.

3 SHEETSSHEET 3.

lmlilnllnm Q mi.

* Illllll llllill THE NORRIS PETERS 60.. PH01D-LITHO,. WASHINGTON D. C

ALBERT L. GOLBTl'RN, OF NEW HAVEN, CONNECTICUT.

TWO-REVOLUTION RECIPROCATING- FLAT-BED PRINTING-PRESS.

To all whom it may concern:

Be it known that I, ALBERT L. COLBURN, a citizen of the United States, residing at New Haven, in the county of New Haven 7 and State of Connecticut, have invented a new and useful Improvement in Two-Revolution Reciprocating F lat-Bed, Printing Presses and I do hereby declare; the following, when taken in'connection-wi'th the accompanying drawings and characters of reference marked thereon, to be a full, clear, and exact descriptionof the same, and whichsaid drawings constitute part of this application, and represent, in

Figure 1 a broken view in side elevation of a two revolution reciprocating fiat-bed printing press embodying-my invention, the

. type-bed being shown at the limit of its for ward excursion. Fig. 2 a broken plan view thereof. Fig. 3 a brokenview of the press in front elevation, showing a pivotal bed-rack in its printing position. Fig. 4 a corresponding view showing the pivotal bed-rack in its clearance position for the return mofly-wheel 3 and fast and loose pulleys 4 and 5, is journaled at its outerend in atwo-part box 6 at theupper end of a. standard 7, while itsvinner end is journaled in the frame 8.0f

,the press. Near its inner end, the said shaft 2 is provided with a' driving pinion 9 mesh- I ing into the bed-driving main gear 10 which is mounted upon theouter endof a ,main shaft 11 provided at its inner end with a short crank 12 carrying a long crank-pin 13 to the end of which is rigidly secured a secondary crank 14 carrying a crank-pin 15. Thesaid pin 13 carriesthe rear end of a Specification of Letters Patent.

- and mode of mounting.

7 Patented Apr. 2'7, 1915.

, 7 Application filed September 21, 1914. a Serial N 0. 862,697.

lower connecting rod 16 the forward end of which is connected by a pin 17 with the lower end. of the relativelyshort type-bed lever 18. The saidpin 15 also carries the rearend of an upper connecting rod 19, the forward end of which is connected by a pin 20 with the said lever 18 about midway the length-thereof.;.The upper end of the said lever 18 is connected by a pin 21 to the reciprocating flat type-bed 22 which may be of any approved construction as to its form By preference, especlally in large presses, I employa secondary shaft 23 located in line with the main-shaft 1'1 aforesaid and provided at its inner end with a supplemental crank ;24 receiving and supporting the outer end of the crank-pin 15. shaft 23 aforesaid is provided with a gear The secondary wheel 25 meshed into by a gear wheel 26 mounted upon'an idle shaft 27 carrying a gear wheel 28 meshing into a gear wheel 29 on the shaft 11, the power of which is thus utilized for driving the secondary shaft 23 carrying the crank 24, whereby the strains 'upon the various cranks 12, 14 and 24, are

equalized. If desired, the crank 24 may be;

dispensed with. a

By means of the double crank construction abovefdescribed, reference now being had to the cranks 12 and 14, the lever 18 is provided, as it were, with a movable fulcrum at the point 17, whereby I am enabled to keep the type bed 22 well toward the floor, as compared with ordinary pressesof this typein which the type bed lever is not provided with a movable fulcrum, and therefore must be made relatively longer than the lever 18. I

The two-revolution cylinder 30,; ;which may be of any approved construction and provided with any of the means ordinarily employed for raising and lowering such a cylinder, is driven by the meshing of the driving pinion 9 into a concentric gear 31 secured .to an irregular gear 32, the said gears 31 and 32 turning loosely upon a stud the adjacent trunnion 35 of the cylinder 30,

which .is furnished with a-cylinder gear 36 V intermittently meshed into the register-rack 37 of the type bed 22.

For clearing the teeth of the rack 37 from the gear 36'to permitof the returnmovernent of the bed 22, the rack is thrown out ofthei path ofthe said gear. For thispurpose I employ, as herein shown, a cam 38'Inounted p n the nhaft zand. meeting w h;

an arm 39 located at the rear end of a rock:

shaft 40 extending parallel with thepressframe 8 and journaled at its ends in brackets 41, 41, secured thereto, as clearly. shown in Fig. 2. Thesaid rock-shaft 40 carries two upstanding arms 42,42, rig dly secured to it and at their upper ends adapted to receive the resp'ectivetrunnions 43 of an oscillating coupling-piece 44 which, as shown,

' thereof.

is T-shaped in cross-section. The 'l l dinal rib 45 ofthe saidcouplin'g-piece or.

.bar 44' is straddled,'as it were,'by the'slotted lower endof a sliding coupling-arm 46f 'rigidly' secured to and depending from ,the'

forward end of a rock-shaft 47 journaled at its endsin brackets 48, 4 8, securedto the type-bed 22 at the ends thereof. The rack I 37 is rigidly secured at its. ends'to the upper ends of rack-carryingarms 49 ,rigidly'wsecured to the rock-shaft 47-near the ends It will be understood thatthe cylinder 30 is continuously revolved in' the direction of the arrow 0;, and'that it completes two revo lutions for each complete movement .of the type-bed 22 back and forth. Inthe printmg or rearward excursion of the type-bed V 22, the register-rack 37 is lifted-into its upment of the type-bed, before the rack 37 has been carried far enough to mesh'intothe gear 36, the cam 38 acts to causethe rack to be tilted'into its clearance position in which it is shown in Fig. 4, and 1n which its teeth 7 arecarried out of line with the teeth of the gear 36 which continues to revolve with the cylinder 30- asalready stated. Then'on the return motion of the bed 22 after the rear end of the rack 37 has entirely cleared the gear 36, the said cam 38 operates to swing the rack back into its printing position in readiness for the next printing excursion of the bed.

ployed three cranks l2, l4 and- 24, and have explained that if desired the crank 24 may be dispensed with, inwhich case the secondary shaft 23, gear wheels 25, 26,28 and 29 and the shaft 27 will also bedispensed with, whereby the driving of the bed will be devolved upon the cranks 12 and 14 which are rigidly connected by the crankpin 13 as, already described and as shown in other. parts above enumerated will be re,

tained since they will be required to properly distribute the-power required to drive. the

I may now explain, also, thatthe crank 14 may if desired, be omitted in which case the crank 24 and the other parts just-above enumerated will be retained in typeebed.

connection with the crank 12., It is tocbe noted that the crank 24- is equal to the combined efiective length of the cranks 12 and 14.

1. In-a two-revolutionreciprocatingflatbed printing press, the combination with a cylinder, of means; for rotating the same, a I typebed, a lever pi-votedat its upper end to the said type-bed, a connecting rod pivoted atone end to the lower end of the said-lever,

'a connecting rodpivoted at one end-to the i1 said lever-ata point between-the pivotal connection thereof with the type-bed andthe pivotal connection thereof with the other connecting rod, a main shaft, and crank con- 'nections between the said main shaft 'and' the opposite ends of the said connecting rods,

rooated back and forth.

type-bed, a lever pivoted at itsjupper end to the said type-bed, a connecting rod pivotedat one end to the lower end of the said lever, Y

'a connecting rod pivoted at one end-'to'said lever at a point aboutmidway the "length thereof. two cranks connected withtheoppo-- site ends of the said rods, and a main shaft" uponwhich the-saidcranks are L mounted, whereby the said type-bed is reciprocated;

back and forth.

3. In a two-revolution;reciprocating flatbed printing press, thecombination Wlth a reciprocating type-bed, of a lever for operatnecting rod extending between the said pin and the lower end of the lever, vacrank car ried by the said pin, and. a connecting rod extending between the crank last mentioned 7 r and the lever at a point imidway thelength In. the construction shown, I have emthereof.

4. In a two-revolution fiat-bed printingv ing the same, adrivlng shaft, a crank there-M.v 1

upon, a pin earned by the said crank; a con-:

press, the combination with a reciprocating type-bed, of: a lever having its upper end pivoted to the said bed for operating-the" same, a connecting rod connected at one endwith the lower end of the said lever, a connecting rod connected at one'end with the said lever about midway the length thereof, I a driving shaft mountlng cranks respectively.

connected with the opposite end of the In testimony whereof, I have signed this said rods, a supplemental crank connected specification in the presence of two subwith' the rod which is pivoted to the lever scribing witnesses.

about midway the Ian h vthereof, and a sec- ALBERT L. COLBURN. ondary shaft located 1n line with the main Witnesses:

shaft and mounting the said supplemental M. P. 'NIQHOK,

crank. C. L. WEED.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

